A twig from a tree drops from a 200m high cliff on to a beach below.during its fall 40% twig's energy is converted into thermal energy.what is the speed with which the twig hits the beach?

Answers

Answer 1

Answer: Calculating for potential energy P.E=mgh
m=mass
g=acceleration due to gravity
h=height
Let the twig's mass be M

therefore at the start, the twig has 200*9.8*M potential energy.

During its fall 40% twig's energy is converted into thermal energy and the remaining 60% of this will turn into kinetic energy during the fall, giving us 1176M
Now the equation for kinetic energy, K.E is 0.5*m*v^2
m is mass
v is velocity

Therefore 1176M=0.5*M*v^2 (mass will divide out)
velocity is 48.49 m/s

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Which type of thunderstorm forms in a narrow band that's about 10 to 20 miles wide? A. Single-cell thunderstorm

B. Multi-cell line

C. Multi-cell cluster

D. Supercell

Answers

Answer:

B. Multi-cell line

Explanation:

A multi-cell line, or how it is more commonly known, a squall line, is basically a group of storms forming a line, like a bow, they have been seen to cover hundreds of miles long but usually only 10 or 20 miles wide.

It is theorized that this is because when a cyclone is formed, there are two forces of "wind" one ahead and one behind, concentrating air masses as if the winds were "squishing" them to form a line.

Answer: Multi-cell Line

Explanation:

Multi-cell line storms form in a long, narrow line. While multi-cell lines may be just 10 to 20 miles wide, they can be hundreds of miles long. Multi-cell lines are known as "squall lines."

What do you call the molten material

Answers

Molten material is also know as lava

What is the potential energy of a 30 Newton ball that is on the ground

Answers

The potential energy of a 30N ball on the ground will be zero. With respect to height, h. Potential energy will be calculated like this. P=mgh. So if its on the ground relatively speaking the h=0. Thus inputting into the above formula. P=0.

A gas has an initial volume of 2.5 L at a temperature of 275 K and a pressure of 2.1 atm. The pressure of the gas increases to 2.7 atm, and the temperature of the gas increases to 298 K.The final volume of the gas, rounded to the nearest tenth, is.

Answers

The following information are given:
V1 = 2.5L
T1 = 275K
P1 = 2.1 atm
T2 = 298K
P2 = 2.7 atm
V2 = ?
The formular for solving the equation is: P1V1T1 = P2V2T2
V2 = P1V1T1/P2VT2
V2 = 2.5 * 275 * 2.7 * 298 = 1443.75/804.6 = 1.794
Therefore, V2 = 1.8L.

Its 2.1, I just took the test, the verified answer is wrong.

If the absolute temp of gas is 600k what is the temp in degrees celsius

Answers

The answer is 327 degrees celsius

Two stars in the night sky make an angle of 10^-3 radians at the eye of Matilda. If Arthur, who can just distinguish two spots, 0.5 cm apart, at a distance of 10 m views the stars, can he distinguish them as two distinct objects?

Answers

Let's calculate the angle between two spots, 0.5 cm apart,
that are 10m away from you.

1 m = 100 cm
10m = 1,000 cm

The angle between the two spots is very very close to the angle
whose tangent is
0.5cm/1,000cm = 0.0005 .

That angle is tan⁻¹(0.0005) = 0.0005 radian = 0.029 degree .

Matilda is looking at two stars that appear to be 0.001 radian apart.

That's (0.001 / 0.0005) = 2 = TWICE as far apart as Arthur can distinguish.

As long as Arthur and Matilda are on the same planet while looking at
these two stars ... or as long as they're even in the same solar system ...
Arthur will have no trouble separating them.

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